Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Loans Modified as Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Beginning balance	$ 1,813	$ 1,061	$ 602
Additions	113	37	1,017
Net payments	(940)	(86)	(144)
Net transfers from (to) non-accrual	785	801	(414)
Ending balance	1,771	1,813	1,061
Beginning balance	7,314	1,569	552
Additions	5,254	8,408	681
Net payments	(2,310)	(1,718)	(78)
Charge-offs	(673)	(144)
Net transfers from (to) accrual	(785)	(801)	414
Ending balance	8,800	7,314	1,569
Total troubled debt restructurings	$ 10,571	$ 9,127	$ 2,630